# 第二十届HAPOF论坛，Observation of new resonances decaying to J/ψK+ and J/ψϕ，张黎明 教授，2021年03月12日

Asia/Shanghai
Description
报告人：张黎明 教授 (清华大学）

The first observation of exotic states with a new quark content cc¯us¯ decaying to the J/ψK+ final state is reported with high significance from an amplitude analysis of the B+→J/ψϕK+ decay. The analysis is carried out using proton-proton collision data corresponding to a total integrated luminosity of 9 fb−1collected by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV. The most significant state, Zcs(4000)+, has a mass of 4003±6+4−14 MeV, a width of 131±15±26 MeV, and spin-parity JP=1+, where the quoted uncertainties are statistical and systematic, respectively. A new 1+ X(4685) state decaying to the J/ψϕ final state is also observed with high significance. In addition, the four previously reported J/ψϕ states are confirmed and two more exotic states, Zcs(4220)+ and X(4630), are observed with significance exceeding five standard deviations.


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